Wireless device and wireless transmission method
地域：
Kanasaki-shi, Kanagawa
摘要
A wireless device includes: a plurality of antennas; a first correlation series generator configured to generate a first correlation series based on transmission data; a second correlation series generator configured to generate a second correlation series based on the first correlation series; a first modulator configured to modulate the transmission data to generate a first modulated signal; a second modulator configured to modulate the first correlation series to generate a second modulated signal; a third modulator configured to modulate the second correlation series to generate a third modulated signal; a signal combiner configured to combine the first to third modulated signals to generate first to third transmission signals; and a transmitter configured to output the first to third transmission signals respectively via first to third antennas among the plurality of antennas.
說明書
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This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2019-054276, filed on Mar. 22, 2019, the entire contents of which are incorporated herein by reference.
The embodiments discussed herein are related to a wireless device and a wireless transmission method.
In wireless communications, radio waves also arrive at terminal devices other than a destination node. Hence, such communications will involve a higher risk of interception than wire communications such as optical fiber communications. Accordingly, a proposed method is one for implementing a secure communication by using characteristics of a wireless channel between a source node and a destination node in addition to mathematical encryption for encrypting transmission data.
For example, the source node may transmit a signal to which distortions in the wireless channel between the source node and the destination node have been added. Then, the destination node receives the signal with the distortions canceled out in the wireless channel. Hence, the destination node can recover data from the received signal. However, since the wireless channel between the source node and another terminal device is different from that between the source node and the destination node, distortions in a signal arriving at the other terminal device are not canceled out. Hence, the other terminal device cannot recover data from the received signal (e.g., International Publication Pamphlet No. WO 2009/022423).
權(quán)利要求
What is claimed is:1. A wireless device comprising:a plurality of antennas; a first correlation series generator configured to generate a first correlation series based on transmission data; a second correlation series generator configured to generate a second correlation series based on the first correlation series; a first modulator configured to modulate the transmission data to generate a first modulated signal; a second modulator configured to modulate the first correlation series to generate a second modulated signal; a third modulator configured to modulate the second correlation series to generate a third modulated signal; a signal combiner configured to combine the first modulated signal, the second modulated signal and the third modulated signal to generate a first transmission signal, a second transmission signal and a third transmission signal; and a transmitter configured to output the first transmission signal, the second transmission signal and the third transmission signal respectively via a first antenna, a second antenna and a third antenna among the plurality of antennas. 2. The wireless device according to claim 1 , whereina number of symbols of the transmission data, a number of symbols of the first correlation series, and a number of symbols of the third correlation series are equal. 3. The wireless device according to claim 1 , whereinthe first to third modulators use a same modulation scheme. 4. The wireless device according to claim 3 , whereina correlation between the transmission data and the first correlation series and a correlation between the first correlation series and the second correlation series are respectively determined according to a number of bits per symbol of the modulation scheme. 5. The wireless device according to claim 1 , whereina correlation between the transmission data and the first correlation series and a correlation between the first correlation series and the second correlation series are respectively determined according to a correlation between a plurality of wireless channels configured between a destination node and the first to third antennas. 6. The wireless device according to claim 1 , whereina correlation between the transmission data and the first correlation series and a correlation between the first correlation series and the second correlation series are respectively determined according to a number of antennas of the wireless device. 7. The wireless device according to claim 1 , whereinaccording to a state of a wireless channel between the wireless device and a destination node, the signal combiner combines the first modulated signal, the second modulated signal and the third modulated signal to generate the first transmission signal, the second transmission signal and the third transmission signal in a manner such that the first correlation series and the second correlation series are canceled out at the wireless channel. 8. The wireless device according to claim 1 , whereinwhen the wireless device includes N antennas, N being an integer that is 4 or larger,(N?1) correlation series that include the first correlation series and the second correlation series are generated, (N?1) modulated signals that include the second modulated signal and the third modulated signal are respectively generated from the (N?1) correlation series, and the signal combiner combines the first modulated signal and the (N?1) modulated signals to generate N transmission signals that include the first transmission signal, the second transmission signal and the third transmission signal, and the transmitter outputs the N transmission signals via the N antennas. 9. A wireless communication method comprising:generating a first correlation series based on transmission data, generating a second correlation series based on the first correlation series, modulating the transmission data to generate a first modulated signal, modulating the first correlation series to generate a second modulated signal, modulating the second correlation series to generate a third modulated signal, combining the first modulated signal, the second modulated signal and the third modulated signal to generate a first transmission signal, a second transmission signal and a third transmission signal, and outputting the first transmission signal, the second transmission signal and the third transmission signal respectively via a first antenna, a second antenna and a third antenna. 10. A wireless device comprising:a plurality of antennas; a first correlation series generator configured to generate a first correlation series based on transmission data; a second correlation series generator configured to generate a second correlation series based on the transmission data; a first modulator configured to modulate the transmission data to generate a first modulated signal; a second modulator configured to modulate the first correlation series to generate a second modulated signal; a third modulator configured to modulate the second correlation series to generate a third modulated signal; a signal combiner configured to combine the first modulated signal, the second modulated signal and the third modulated signal to generate a first transmission signal, a second transmission signal and a third transmission signal; and a transmitter configured to output the first transmission signal, the second transmission signal and the third transmission signal respectively via a first antenna, a second antenna and a third antenna among the plurality of antennas. 11. A wireless device comprising:a plurality of antennas; a correlation series generator configured to generate a first correlation series and a second correlation series, the second correlation series being correlated with the first correlation series; a first modulator configured to modulate transmission data to generate a first modulated signal; a second modulator configured to modulate the first correlation series to generate a second modulated signal; a third modulator configured to modulate the second correlation series to generate a third modulated signal; a signal combiner configured to combine the first modulated signal, the second modulated signal and the third modulated signal to generate a first transmission signal, a second transmission signal and a third transmission signal; and a transmitter configured to output the first transmission signal, the second transmission signal and the third transmission signal respectively via a first antenna, a second antenna and a third antenna among the plurality of antennas.
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